Palo, also known as Las Reglas de Congo, is an African diasporic religion that developed in Cuba during the late 19th or early 20th century. It arose through a process of syncretism between the traditional Kongo religion of Central Africa, the Roman Catholic branch of Christianity, and Spiritism. Initiates in the religion are termed paleros (male) or paleras (female).
An initiatory religion, Palo is organised through small autonomous groups called munanso congo, each led by a figure known as a tata (father) or yayi (mother). Although teaching the existence of a creator deity, Nsambi or Sambia, Palo regards this entity as being uninvolved in human affairs and thus focuses its attention on the spirits of the dead, collectively known as Kalunga. Central to Palo is the nganga or prenda, a vessel usually made from an iron cauldron, clay pot, or gourd. Many nganga are regarded as material manifestations of particular deities known as mpungu. The nganga will typically contain a wide range of objects, among the most important being sticks and human remains, the latter called nfumbe. In Palo, the presence of the nfumbe means that the spirit of the dead person inhabits the nganga and serves the palero or palera who keeps it. The Palo practitioner commands the nfumbe, through the nganga, to do their bidding, typically to heal but also to cause harm. Those nganga primarily designed for benevolent acts are baptised; those largely designed for malevolent acts are left unbaptised. The nganga is "fed" with the blood of sacrificed animals and other offerings, while its will and advice is interpreted through various forms of divination.
Palo developed among Afro-Cuban communities following the Atlantic slave trade of the 16th to 19th centuries. It formed through the blending of the traditional religions brought to Cuba by enslaved Bakongo people from Central Africa with ideas from Roman Catholicism, the only religion legally permitted on the island by the Spanish colonial government.